Answer 1

1-
if u dont want it to go outside of the div

just add
//left
if(f>0)
f--;

and
//right
if(f>=widthof the div)
f++;

and
//up
if(t>0)
t--;

//down
if (t<=height of div)
t++;

2-
on css
add
body{
user-selection:none;
}

to not select the text in the buttons

3-
its better to use canvas for games

Answer 2

Here you will find something similar:

https://www.w3schools.com/graphics/game_intro.asp

Answer 3

Arjun Dawande
That all you can learn in Sololearns game development with Javascript.

Answer 4

Arjun Dawande You go to section Learn, then click on selection above and click on „discover all courses“ to see all offered courses.

Or click here:

https://sololearn.com/learn/courses/le-gamedev-with-js

Answer 5

I can see that in Sololearns app. Did you try that in the app or in the website?

Answer 6

Maybe the course was old and is in the meantime deleted.